They do hibernate well. You can put any poikilothermic animal in the fridge without harming it.
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That's only true up to a point. Furthermore, that's not true hibernation (or brumation, since they're reptiles).
Temperate reptiles can handle this type of treatment far better than tropical reptiles. In fact, doing this is probably a good way to kill a tropical herp.
I guess it's good I've never had one as a pet... :-}